﻿// Copyright 2018 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace CastleTests.Facilities.TypedFactory
{
	using System;

	using Castle.Facilities.TypedFactory;
	using Castle.MicroKernel.Registration;

	using NUnit.Framework;

	public sealed class BurdenAddedToUnrelatedObjectTestCase : AbstractContainerTestCase
	{
		protected override void AfterContainerCreated()
		{
			Container.AddFacility<TypedFactoryFacility>();
		}

		[Test]
		public void Object_resolved_from_factory_is_not_added_as_burden_of_object_being_created()
		{
			Container.Register(
				Component.For(typeof(IFactory<>)).AsFactory(),
				Component.For<Foo>().LifeStyle.Transient,
				Component.For<LongLivedService>().LifeStyle.Singleton,
				Component.For<ShortLivedViewModel>().LifeStyle.Transient);

			var longLivedService = Container.Resolve<LongLivedService>();
			var shortLivedViewModel = Container.Resolve<ShortLivedViewModel>();

			var prematureDisposalHandler = new EventHandler((s, e) =>
				Assert.Fail("Long-lived service’s connection was disposed when short-lived view model was released."));

			longLivedService.SqlConnection.Disposed += prematureDisposalHandler;
			Container.Release(shortLivedViewModel);
			longLivedService.SqlConnection.Disposed -= prematureDisposalHandler;

			Container.Release(longLivedService);
		}

		public sealed class Foo : IDisposable
		{
			public event EventHandler Disposed;

			public void Dispose() => Disposed?.Invoke(this, EventArgs.Empty);
		}

		public interface IFactory<T>
		{
			T Resolve();
			void Release(T instance);
		}

		public sealed class LongLivedService
		{
			public IFactory<Foo> FooFactory { get; }

			public Foo SqlConnection { get; private set; }

			public LongLivedService(IFactory<Foo> fooFactory)
			{
				FooFactory = fooFactory;
			}

			public void StartSomething()
			{
				SqlConnection = FooFactory.Resolve();
			}

			public void Dispose()
			{
				FooFactory.Release(SqlConnection);
			}
		}

		public sealed class ShortLivedViewModel
		{
			public IFactory<Foo> FooFactory { get; }
			public LongLivedService LongLivedService { get; }

			public ShortLivedViewModel(IFactory<Foo> fooFactory, LongLivedService longLivedService)
			{
				FooFactory = fooFactory;
				LongLivedService = longLivedService;
				longLivedService.StartSomething();
			}
		}
	}
}
